| 1 | /* |
| 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | * |
| 6 | * @(#)kern_subr.c 7.3 (Berkeley) %G% |
| 7 | */ |
| 8 | |
| 9 | #include "param.h" |
| 10 | #include "systm.h" |
| 11 | #include "user.h" |
| 12 | |
| 13 | uiomove(cp, n, uio) |
| 14 | register caddr_t cp; |
| 15 | register int n; |
| 16 | register struct uio *uio; |
| 17 | { |
| 18 | register struct iovec *iov; |
| 19 | u_int cnt; |
| 20 | int error = 0; |
| 21 | |
| 22 | if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) |
| 23 | panic("uiomove: mode"); |
| 24 | while (n > 0 && uio->uio_resid) { |
| 25 | iov = uio->uio_iov; |
| 26 | cnt = iov->iov_len; |
| 27 | if (cnt == 0) { |
| 28 | uio->uio_iov++; |
| 29 | uio->uio_iovcnt--; |
| 30 | continue; |
| 31 | } |
| 32 | if (cnt > n) |
| 33 | cnt = n; |
| 34 | switch (uio->uio_segflg) { |
| 35 | |
| 36 | case UIO_USERSPACE: |
| 37 | case UIO_USERISPACE: |
| 38 | if (uio->uio_rw == UIO_READ) |
| 39 | error = copyout(cp, iov->iov_base, cnt); |
| 40 | else |
| 41 | error = copyin(iov->iov_base, cp, cnt); |
| 42 | if (error) |
| 43 | return (error); |
| 44 | break; |
| 45 | |
| 46 | case UIO_SYSSPACE: |
| 47 | if (uio->uio_rw == UIO_READ) |
| 48 | bcopy((caddr_t)cp, iov->iov_base, cnt); |
| 49 | else |
| 50 | bcopy(iov->iov_base, (caddr_t)cp, cnt); |
| 51 | break; |
| 52 | } |
| 53 | iov->iov_base += cnt; |
| 54 | iov->iov_len -= cnt; |
| 55 | uio->uio_resid -= cnt; |
| 56 | uio->uio_offset += cnt; |
| 57 | cp += cnt; |
| 58 | n -= cnt; |
| 59 | } |
| 60 | return (error); |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Give next character to user as result of read. |
| 65 | */ |
| 66 | ureadc(c, uio) |
| 67 | register int c; |
| 68 | register struct uio *uio; |
| 69 | { |
| 70 | register struct iovec *iov; |
| 71 | |
| 72 | again: |
| 73 | if (uio->uio_iovcnt == 0) |
| 74 | panic("ureadc"); |
| 75 | iov = uio->uio_iov; |
| 76 | if (iov->iov_len <= 0 || uio->uio_resid <= 0) { |
| 77 | uio->uio_iovcnt--; |
| 78 | uio->uio_iov++; |
| 79 | goto again; |
| 80 | } |
| 81 | switch (uio->uio_segflg) { |
| 82 | |
| 83 | case UIO_USERSPACE: |
| 84 | if (subyte(iov->iov_base, c) < 0) |
| 85 | return (EFAULT); |
| 86 | break; |
| 87 | |
| 88 | case UIO_SYSSPACE: |
| 89 | *iov->iov_base = c; |
| 90 | break; |
| 91 | |
| 92 | case UIO_USERISPACE: |
| 93 | if (suibyte(iov->iov_base, c) < 0) |
| 94 | return (EFAULT); |
| 95 | break; |
| 96 | } |
| 97 | iov->iov_base++; |
| 98 | iov->iov_len--; |
| 99 | uio->uio_resid--; |
| 100 | uio->uio_offset++; |
| 101 | return (0); |
| 102 | } |
| 103 | |
| 104 | strcat(src, append) |
| 105 | register char *src, *append; |
| 106 | { |
| 107 | |
| 108 | for (; *src; ++src) |
| 109 | /* void */; |
| 110 | while (*src++ = *append++) |
| 111 | /* void */; |
| 112 | } |
| 113 | |
| 114 | strcpy(to, from) |
| 115 | register char *to, *from; |
| 116 | { |
| 117 | |
| 118 | for (; *from = *to; ++from, ++to) |
| 119 | /* void */; |
| 120 | } |
| 121 | |
| 122 | strncpy(to, from, cnt) |
| 123 | register char *to, *from; |
| 124 | register int cnt; |
| 125 | { |
| 126 | |
| 127 | for (; cnt && (*to = *from); --cnt, ++from, ++to) |
| 128 | /* void */; |
| 129 | *to = '\0'; |
| 130 | } |
| 131 | |
| 132 | #ifdef notdef /* unused */ |
| 133 | /* |
| 134 | * Get next character written in by user from uio. |
| 135 | */ |
| 136 | uwritec(uio) |
| 137 | struct uio *uio; |
| 138 | { |
| 139 | register struct iovec *iov; |
| 140 | register int c; |
| 141 | |
| 142 | if (uio->uio_resid <= 0) |
| 143 | return (-1); |
| 144 | again: |
| 145 | if (uio->uio_iovcnt <= 0) |
| 146 | panic("uwritec"); |
| 147 | iov = uio->uio_iov; |
| 148 | if (iov->iov_len == 0) { |
| 149 | uio->uio_iov++; |
| 150 | if (--uio->uio_iovcnt == 0) |
| 151 | return (-1); |
| 152 | goto again; |
| 153 | } |
| 154 | switch (uio->uio_segflg) { |
| 155 | |
| 156 | case UIO_USERSPACE: |
| 157 | c = fubyte(iov->iov_base); |
| 158 | break; |
| 159 | |
| 160 | case UIO_SYSSPACE: |
| 161 | c = *iov->iov_base & 0377; |
| 162 | break; |
| 163 | |
| 164 | case UIO_USERISPACE: |
| 165 | c = fuibyte(iov->iov_base); |
| 166 | break; |
| 167 | } |
| 168 | if (c < 0) |
| 169 | return (-1); |
| 170 | iov->iov_base++; |
| 171 | iov->iov_len--; |
| 172 | uio->uio_resid--; |
| 173 | uio->uio_offset++; |
| 174 | return (c & 0377); |
| 175 | } |
| 176 | #endif /* notdef */ |